Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd2ba917797b341…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 21:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33851a2cbe26b17f274978ffe6d78162 SHA-1: da9d2a1f3f9bcd1cb410a72454a79927ffcf2085 SHA-256: 4bd2ba917797b34133e84977ec99bd75078b9b8ebc22d821327389eda2b94e5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of link manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.ishvani.com/www/js/ckfinder/userfiles/files/26058328809.pdf In PDF document text
    • http://ajtoablakcentrum.com/_user/file/99958458310.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/4499280466.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/kutupetufakedowurid.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/xetobigani.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/93730336189.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/wimipew.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/39139626772.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/diketakavunoj.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/golakapigusaro.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0e002715d1c69a9aa623eb84b89c8a98/94037252829.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/57007498407.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/64224280041.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161403b985ee20---zovujajobogoxijewef.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/zomobiwukusuzeneneropotew.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed6cbaf819---45079151293.pdfIn PDF document text
    • https://sambelteri.com/contents/files/xemomivasorosupi.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/13471619321.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/texirifizodenozajig.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/18351088861.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/xunonenepud.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/64251614459.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/kigatuvibevef.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/fojibatanamezigajari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=when+is+season+5+of+my+hero+coming+outPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B0 16024 bytes
SHA-256: 2173e2fd205233fb0a1b83a12f13940c8dfb9a86939f423e5c69f179449267ba
font_01_sfnt_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 11076 bytes
SHA-256: 56889e2ea81d531a20d87618b12892bab8944514f97533374412613d4244a691

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